Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/21803

21803

ZIP 21803 is in Salisbury, Maryland, in Wicomico County; area codes 410, 667 and 443; Eastern time. Salisbury has 4 ZIP codes; the others are 21801, 21802 and 21804.

Type
No street area
Time zone
America/New_York
County
Wicomico
Metro area
Salisbury, MD
Coordinates
38.3884, -75.6276

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 21801, whose figures describe that area — not this ZIP code.

☼ Live from 21803 — Salisbury, MD

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Where 21803 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 21803
  • 🔢 Type 21803 into a pocket calculator and turn it upside down: EOBIZ — not quite a word, sorry.
  • ➕ 21803 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010100101011
  • 🏠 Its numerical neighbours: 21802 (Salisbury, MD, 0 mi away) and 21804 (Salisbury, MD, 7 mi away).
  • 🔄 Backwards, 21803 becomes 30812 — and that is a real ZIP code: Gracewood, GA, 499 miles away.
  • 👥 70 other ZIP codes are made of exactly the same digits (01238, 01832, 02138, 02381, 02813, 02831, …). The farthest-flung twin is 83210 in Aberdeen, ID, 1,960 miles away.
  • 🧭 Farther south than 56% of all ZIP codes, and farther east than 86%.
  • 🎯1,231 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21803 and you would come out at 38.39°S, 104.37°E — 786 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 29m.
🌙 The sky over 21803 today
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Source: USGS.

Business and tax activity

Business establishments4This ZIP4
Employees22This ZIP22
Annual payroll$844,000This ZIP$844,000

Land area

ZIP codes near 21803

ZIPCityDistance
21802 Salisbury, MD 0.0 mi
21801 Salisbury, MD 3.9 mi
21826 Fruitland, MD 4.7 mi
21875 Delmar, MD 5.7 mi
21830 Hebron, MD 5.8 mi
19940 Delmar, DE 7.0 mi
21822 Eden, MD 7.1 mi
21804 Salisbury, MD 7.3 mi
21810 Allen, MD 7.5 mi
21837 Mardela Springs, MD 8.8 mi

Find every ZIP code within 10 miles of 21803 →

Questions about this ZIP code

Where is ZIP code 21803?

21803 is in Salisbury, Maryland, in Wicomico County, part of the Salisbury, MD metropolitan area. Its published point location is 38.3884, -75.6276.

What county is 21803 in?

21803 lies in Wicomico County.

What area code is 21803?

Salisbury uses area codes 410, 667 and 443, from NANPA's telephone records.

What time zone is 21803 in?

21803 uses America/New_York.

What ZIP codes are near 21803?

The closest are 21802 (0 mi), 21801 (3.9 mi), 21826 (4.7 mi), 21875 (5.7 mi) and 21830 (5.8 mi).

Is 21803 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “21803 ZIP Code — Salisbury, Maryland (Wicomico County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21803

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21803.json

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